383 not performing

Reply Subscribe

Thread Tools

Search this Thread

Apr 24, 2014 | 09:30 PM

Servergos

Thread Starter

Cruising

Joined: Apr 2014

Posts: 14

Likes: 0

From: California

383 not performing

Hi everyone,

I'm new to any type of forums and this is my first go at it.
I have a 01 C5Z that I recently got rebuilt by a local shop. I decided to go with a 383 stroker, but I'm very disappointed with the performance number that it made on the dynojet. 360hp 384torque at 5k rpm it felt like a slap to the face seeing these numbers. The kit was advertised at 550 plus hp and I'm not even making stock z06 power ! I spoke with the person who built my motor and he said that my stock Z06 headers and exhaust we're preventing it from making the power. Can headers and exhaust really rob me from all that power?

Apr 24, 2014 | 10:56 PM

Dcollins3208

Burning Brakes

Joined: Oct 2013

Posts: 859

Likes: 1

Is it just stroked or do you have a heads/cam combo or any other mods? A stroked only engine won't make 550 hp, not even close, with the stock parts

Apr 24, 2014 | 11:08 PM

Servergos

Thread Starter

Cruising

Joined: Apr 2014

Posts: 14

Likes: 0

From: California

Quote:

Originally Posted by Dcollins3208

Is it just stroked or do you have a heads/cam combo or any other mods? A stroked only engine won't make 550 hp, not even close, with the stock parts

Thanks for replying.
It has a forged 4340 4" stroke crankshaft with reluctor rings
Crankshaft: Forged 4340 Steel, 4" Stroke, Reluctor Ring Installed
Connecting Rods:Pro Billet, 220psi Bolts/Ampco Bronze Bushings, 6.125" Length
Pistons: Forged, Aluminum, 4032 Alloy with Ceramic Coated Tops
Rings: Plasma Moly 1.5 x 1.5 x 3mm
Bearings: Tri Metal Clevite 77
Heads Flow Checked Before & After on SF-600 Flow
Heads Are Milled Using CBN-PCD Cutter Technology for a
Positive Seal
Valve Spring Heights & Pressure Are Set
Positive Sealing Valve Seals Are Installed
Heads Are Vacuum Checked for Quality Control
Heavy Duty Valve Springs & Titanium Retainers Are Used
Cam: comp cam hydraulic roller not too sure on the cam but it passes ca smog
Headers: stock c5 z06

Apr 25, 2014 | 08:25 PM

Servergos

Thread Starter

Cruising

Joined: Apr 2014

Posts: 14

Likes: 0

From: California

Quote:

Originally Posted by Servergos

It was the clutch that was bad it kept slipping on the dynojet

Apr 25, 2014 | 08:48 PM

Z06ness03

Instructor

Joined: Feb 2012

Posts: 125

Likes: 0

From: Bristol CT

That sucks. Sounds to me like you're stroker engine cant breath through that stock exhaust. Also not to make you feel bad but while the heads were off you really should of had them ported to improve the flow.

Apr 25, 2014 | 09:27 PM

Servergos

Thread Starter

Cruising

Joined: Apr 2014

Posts: 14

Likes: 0

From: California

The heads were ported I think I forgot to mention that. The engine is not breathing efficiently thanks to smog requiments but now that I passed smog headers will be on their way along with a new clutch